Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6d90837bc0232f9…

MALICIOUS

PDF

53.0 KB Created: 2020-08-30 02:43:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11b08ce1957466042ca90bb6980e8a97 SHA-1: ddef5e51c3578da80a368b852b1e597e48bc4132 SHA-256: d6d90837bc0232f910ea8cd58bcfc9314dbdf098c7847c98b2b7873e00370952
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, with numerous external links, many pointing to static.usrfiles.com. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to a phishing or malware delivery site. The document body contains garbled text but includes the malicious URL and several benign-looking URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/wix?keyword=couronne+de+l%2527+hiver+%25C3%25A9ternel+wow
    • https://static.usrfiles.com/ugd/b8c837_38da2ded6b5145e7b6739ac9fd3d490c.pdf
    • https://static.usrfiles.com/ugd/b8c837_55bf3f6d318a4a059be0e1e5e90bd68c.pdf
    • https://static.usrfiles.com/ugd/b8c837_05f288aff3d64d7496fe0bdac36ce92d.pdf
    • https://static.usrfiles.com/ugd/b8c837_283fb3897a294bedabd8e8dd2706be84.pdf
    • https://static.usrfiles.com/ugd/b8c837_f7b47430b7c44f8a9358f8e2043f38af.pdf
    • https://static.usrfiles.com/ugd/b8c837_c5576bb4e82e473a9abac39e90c939a7.pdf
    • https://static.usrfiles.com/ugd/12dc78_2e931b652b3445e996c52c63f9367635.pdf
    • https://static.usrfiles.com/ugd/b8c837_b8ac8470e0cb42a2a898a88c7b77eccc.pdf
    • https://static.usrfiles.com/ugd/b8c837_9fbb5d3da2d44a22b32840ff8658b723.pdf
    • https://static.usrfiles.com/ugd/97368a_c35c1867c7714fbcab7b5c8354e4e5c8.pdf
    • https://cdn.shopify.com/s/files/1/0432/1126/0062/files/85088406545.pdf
    • https://cdn.shopify.com/s/files/1/0448/3212/9184/files/45318758932.pdf
    • https://cdn.shopify.com/s/files/1/0430/4545/3985/files/41705393996.pdf
    • https://cdn.shopify.com/s/files/1/0431/7990/1079/files/certificate_of_completion_in_word_format.pdf
    • https://static.usrfiles.com/ugd/b8c837_0cbf90df8ae845fba507f72abba8354c.pdf
    • https://static.usrfiles.com/ugd/7e6083_63a0b5b6d5214e969343161756331418.pdf
    • https://static.usrfiles.com/ugd/0d2908_f899f234a0e74a93a135ac3a720c8a72.pdf
    • https://static.usrfiles.com/ugd/b8c837_be0d8509641a4398afbdf57e424f8864.pdf
    • https://static.usrfiles.com/ugd/5b604d_8bc675e72165416a9767cb967ef268b8.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006947.bin
43aed4d3f0811c6b69b5d7d8792d1a6aadaf00d312386446ccb5ae52a61e47ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6947 4756 bytes
font_01_sfnt_off00007934.bin
d4708de0bb19a122aaedfeacdf32ea0fb84a08fe51c80dc609e5d4746618cf9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7934 12496 bytes
font_02_sfnt_off0000a0ee.bin
532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0EE 16204 bytes
font_03_sfnt_off0000b61e.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB61E 4324 bytes

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